package com.sen.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.sen.reggie.common.BaseContext;
import com.sen.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.apache.juli.logging.Log;
import org.springframework.stereotype.Component;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @author: Zs
 * @date:2022/6/1 17:33
 */
@SuppressWarnings({"all"})
@WebFilter(filterName = "LoginCheckFilter",
          urlPatterns = "/*"/*通配符（*）表示对所有的web资源进行拦截*/
)
@Component
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1.获取本次请求的URL
        String requestURI = request.getRequestURI();

        log.info("拦截到请求:{}",requestURI);
//        以下资源路径在用户未登录的情况下均被拦截。
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/setmeal/**",
                "/user/sendMsg",
                "/user/login",
                "/doc.html",
                "/webjars/**",
                "/swagger-resouces",
                "/v2/api-docs",
                "/common/**"
        };
        //2.判断本次请求是否处理
        boolean check = check(urls, requestURI);

        //3.如果不需要处理，则直接放行
               if(check){
                   log.info("本次请求{}:不需要处理",requestURI);
                   filterChain.doFilter(request,response);
              return;
               }
        //4.判断登录状态，如果以登录，直接放行
           if(request.getSession().getAttribute("employee")!=null){
               log.info("用户已登录，用户id为:{}",request.getSession().getAttribute("employee"));
             Long empId= (Long) request.getSession().getAttribute("employee");
               BaseContext.setCurrentId( empId);
               filterChain. doFilter(request,response);
               return;
           }
        //4.2判断登录状态，如果以登录，直接放行
        if(request.getSession().getAttribute("user")!=null){
            log.info("用户已登录，用户id为:{}",request.getSession().getAttribute("user"));
            Long userId= (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId( userId);
            filterChain. doFilter(request,response);
            return;
        }
        //5.如果未登录则返回登录
        log.info("用户未登录");
      response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));

        return;
   //     log.info("拦截到请求:{}", request.getRequestURL());

   //   filterChain.doFilter(request, response);


    }

    /**
     * 路径匹配，检查本次请求是否放行
     *
     * @param urls
     * @param requestURL
     * @return
     */
    public boolean check(String[] urls, String requestURL) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURL);
            if (match) {
                return true;
            }
        }
        return false;
    }
}




